Holocaust survivor Naftali Fuerst stands in front of his portrait during the opening of a photography exhibition by German photographer Martin Schoeller titled "Survivors - Faces of Life after the Holocaust" at the former coal mine Zeche Zollverein in Essen, Germany, January 21, 2020. REUTERS/Wolfgang Rattay

Holocaust survivor Naftali Fuerst stands in front of his portrait together with German photographer Martin Schoeller during the opening of a photography exhibition titled "Survivors - Faces of Life after the Holocaust" at the former coal mine Zeche Zollverein in Essen, Germany, January 21, 2020. REUTERS/Wolfgang Rattay

Holocaust survivor Naftali Fuerst stands in front of his portrait together with German Chancellor Angela Merkel during the opening of a photography exhibition by German photographer Martin Schoeller (L) titled "Survivors - Faces of Life after the Holocaust" at the former coal mine Zeche Zollverein in Essen, Germany, January 21, 2020. REUTERS/Wolfgang Rattay

Holocaust survivor Naftali Fuerst stands in front of his portrait together with German Chancellor Angela Merkel during the opening of a photography exhibition by German photographer Martin Schoeller (L) titled "Survivors - Faces of Life after the Holocaust" at the former coal mine Zeche Zollverein in Essen, Germany, January 21, 2020. REUTERS/Wolfgang Rattay

Holocaust survivor Naftali Fuerst stands in front of his portrait together with German Chancellor Angela Merkel during the opening of a photography exhibition by German photographer Martin Schoeller titled "Survivors - Faces of Life after the Holocaust" at the former coal mine Zeche Zollverein in Essen, Germany, January 21, 2020. REUTERS/Wolfgang Rattay

Holocaust survivor Naftali Fuerst shows pictures during the opening of a photography exhibition titled "Survivors - Faces of Life after the Holocaust" at the former coal mine Zeche Zollverein in Essen, Germany, January 21, 2020. REUTERS/Wolfgang Rattay

German Chancellor Angela Merkel opens a photography exhibition titled "Survivors - Faces of Life after the Holocaust" at the former coal mine Zeche Zollverein in Essen, Germany, January 21, 2020. REUTERS/Wolfgang Rattay

A combination picture shows a man landing on Jump Trump, an inflatable structure covered with a giant image of U.S. President Donald Trump at the GetxoPhoto international photography exhibition in Getxo, Spain, September 6, 2018. REUTERS/Vincent West TPX IMAGES OF THE DAY

A combination picture shows a man lands on Jump Trump, an inflatable structure covered with a giant image of U.S. President Donald Trump at the GetxoPhoto international photography exhibition in Getxo, Spain, September 6, 2018. REUTERS/Vincent West

A combination picture shows a woman lands on Jump Trump, an inflatable structure covered with a giant image of U.S. President Donald Trump at the GetxoPhoto international photography exhibition in Getxo, Spain, September 6, 2018. REUTERS/Vincent West

A man lands on Jump Trump, an inflatable structure covered with a giant image of U.S. President Donald Trump at the GetxoPhoto international photography exhibition in Getxo, Spain, September 6, 2018. REUTERS/Vincent West

A man lands on Jump Trump, an inflatable structure covered with a giant image of U.S. President Donald Trump at the GetxoPhoto international photography exhibition in Getxo, Spain, September 6, 2018. REUTERS/Vincent West

A man lands on Jump Trump, an inflatable structure covered with a giant image of U.S. President Donald Trump at the GetxoPhoto international photography exhibition in Getxo, Spain, September 6, 2018. REUTERS/Vincent West

A man lands on Jump Trump, an inflatable structure covered with a giant image of U.S. President Donald Trump at the GetxoPhoto international photography exhibition in Getxo, Spain, September 6, 2018. REUTERS/Vincent West

A woman lands on Jump Trump, an inflatable structure covered with a giant image of U.S. President Donald Trump at the GetxoPhoto international photography exhibition in Getxo, Spain, September 6, 2018. REUTERS/Vincent West

A woman lands on Jump Trump, an inflatable structure covered with a giant image of U.S. President Donald Trump at the GetxoPhoto international photography exhibition in Getxo, Spain, September 6, 2018. REUTERS/Vincent West

A woman lands on Jump Trump, an inflatable structure covered with a giant image of U.S. President Donald Trump at the GetxoPhoto international photography exhibition in Getxo, Spain, September 6, 2018. REUTERS/Vincent West

A woman lands on Jump Trump, an inflatable structure covered with a giant image of U.S. President Donald Trump at the GetxoPhoto international photography exhibition in Getxo, Spain, September 6, 2018. REUTERS/Vincent West

U.S. photographer Annie Leibovitz is reflected in glass during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz speaks to media during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz speaks to media during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz speaks to media during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz and CEO of UBS Sergio Ermotti pose for a photograph during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz speaks to media during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz poses for a photograph during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz poses for a photograph during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz is reflected in glass during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz is reflected in glass during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz gestures during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz is reflected in glass during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

U.S. photographer Annie Leibovitz poses for a photograph during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth TPX IMAGES OF THE DAY

U.S. photographer Annie Leibovitz gestures during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth TPX IMAGES OF THE DAY

U.S. photographer Annie Leibovitz is reflected in glass during a press preview of her exhibition 'WOMEN: New Portraits' at Wapping Hydraulic Power Station in London, Britain January 13, 2016. REUTERS/Stefan Wermuth

The parents of Herve Gourdel, Jean (R) and Genevieve (L) attend the inauguration of a photo exhibition of their son Herve, the French mountain guide who was beheaded a year ago by an Algerian Islamist group, in Nice, France, September 21, 2015. REUTERS/Eric Gaillard

The parents of Herve Gourdel, Jean (2ndR) and Genevieve (R) attend the inauguration of a photo exhibition of their son Herve, the French mountain guide who was beheaded a year ago by an Algerian Islamist group, in Nice, France, September 21, 2015. REUTERS/Eric Gaillard

Chinese artist Ai Weiwei poses for a portrait in during a photocall for his exhibition at the Royal Academy of Arts in London, Britain September 15, 2015. REUTERS/Neil Hall

Chinese artist Ai Weiwei poses for photographers during a photocall for his exhibition at the Royal Academy of Arts in London, Britain September 15, 2015. REUTERS/Neil Hall

Chinese artist Ai Weiwei poses for photographers during a photocall for his exhibition at the Royal Academy of Arts in London, Britain September 15, 2015. REUTERS/Neil Hall TPX IMAGES OF THE DAY

Daimler CEO Dieter Zetsche poses to media with the Mercedes-Benz S 500 cabrio car during the media day at the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 15, 2015. REUTERS/Ralph Orlowski

Daimler CEO Dieter Zetsche poses to media with the Mercedes-Benz S 500 cabrio car during the media day at the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 15, 2015. REUTERS/Ralph Orlowski

Daimler CEO Dieter Zetsche poses to media with the Mercedes-Benz S 500 cabrio car during the media day at the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 15, 2015. REUTERS/Ralph Orlowski

A photographer stands in front of the Sony logo before a news conference at the consumer electronics trade fair IFA in Berlin, September 2, 2015. REUTERS/Axel Schmidt

British artist David Hockney is interviewed in front of his painting "The Group V" at a preview of his exhibition "Painting and Photography" at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. REUTERS/Lucy Nicholson

British artist David Hockney is interviewed in front of his painting "The Group V" (R) and photographic drawing "The Red Table" at a preview of his exhibition "Painting and Photography" at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. REUTERS/Lucy Nicholson

British artist David Hockney is interviewed in front of his painting "The Group V" (R) and photographic drawing "The Red Table" at a preview of his exhibition "Painting and Photography" at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. REUTERS/Lucy Nicholson

British artist David Hockney is interviewed in front of his painting "The Group V" (R) and photographic drawing "The Red Table" at a preview of his exhibition "Painting and Photography" at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. REUTERS/Lucy Nicholson

British artist David Hockney is interviewed in front of his painting "The Group V" at a preview of his exhibition "Painting and Photography" at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. REUTERS/Lucy Nicholson

British artist David Hockney is interviewed in front of his painting "The Group V" at a preview of his exhibition "Painting and Photography" at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. REUTERS/Lucy Nicholson

British artist David Hockney is interviewed in front of his painting "The Group V" (R) and photographic drawing "The Red Table" at a preview of his exhibition "Painting and Photography" at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. REUTERS/Lucy Nicholson

British artist David Hockney smokes a cigarette at a preview of his exhibition "Painting and Photography" at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. REUTERS/Lucy Nicholson

British artist David Hockney is interviewed in front of his painting "The Group V" at a preview of his exhibition "Painting and Photography" at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. REUTERS/Lucy Nicholson

British artist David Hockney is interviewed in front of his painting "The Group V" at a preview of his exhibition "Painting and Photography" at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. REUTERS/Lucy Nicholson

People stand on a giant map of The British Isles in Leeds, northern England, April 23, 2015. The map is part of an outdoor exhibition of aerial photography titled "Britain from the Air". REUTERS/Phil Noble

People stand on a giant map of The British Isles in Leeds, northern England, April 23, 2015. The map is part of an outdoor exhibition of aerial photography titled "Britain from the Air". REUTERS/Phil Noble

Saint-Gobain CEO Pierre Andre de Chalendar poses for a photographer during the opening exhibition called "Oh! Future Sensation" as part of Saint-Gobain's 350th anniversary celebrations, in Sao Paulo March 30, 2015. REUTERS/Nacho Doce

Former U.S. president Jimmy Carter speaks at the opening of a new exhibit, "Countdown to Zero, Defeating Disease" at the American Museum of Natural History in New York, January 12, 2015. Developed in collaboration with The Carter Center, the exhibit, which opens on January 13, uses photography, videography, and artifacts to highlight global efforts to fight infections. Also pictured are Donald Hopkins (C), vice president for Health Programs at The Carter Center and Mark Siddall (R), curator of the Division of Invertebrate Zoology at the American Museum of Natural History. REUTERS/Mike Segar (UNITED STATES - Tags: HEALTH POLITICS SOCIETY)

Former U.S. president Jimmy Carter speaks at the opening of a new exhibit, "Countdown to Zero, Defeating Disease" at the American Museum of Natural History in New York, January 12, 2015. Developed in collaboration with The Carter Center, the exhibit, which opens on January 13, uses photography, videography, and artifacts to highlight global efforts to fight infections. REUTERS/Mike Segar (UNITED STATES - Tags: HEALTH POLITICS SOCIETY)

Former U.S. president Jimmy Carter speaks at the opening of a new exhibit, "Countdown to Zero, Defeating Disease" at the American Museum of Natural History in New York, January 12, 2015. Developed in collaboration with The Carter Center, the exhibit, which opens on January 13, uses photography, videography, and artifacts to highlight global efforts to fight infections. REUTERS/Mike Segar (UNITED STATES - Tags: HEALTH POLITICS SOCIETY)

Former U.S. president Jimmy Carter speaks at the opening of a new exhibit, "Countdown to Zero, Defeating Disease" at the American Museum of Natural History in New York, January 12, 2015. Developed in collaboration with The Carter Center, the exhibit, which opens on January 13, uses photography, videography, and artifacts to highlight global efforts to fight infections. REUTERS/Mike Segar (UNITED STATES - Tags: HEALTH POLITICS SOCIETY)

Former U.S. president Jimmy Carter speaks at the opening of a new exhibit, "Countdown to Zero, Defeating Disease" at the American Museum of Natural History in New York, January 12, 2015. Developed in collaboration with The Carter Center, the exhibit, which opens on January 13, uses photography, videography, and artifacts to highlight global efforts to fight infections. REUTERS/Mike Segar (UNITED STATES - Tags: HEALTH POLITICS SOCIETY)